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A [H 2 DPEphos][MnX 4 ] [X = Br, Cl] tetrahalomanganates(II) with P,P'-diprotonated bis[2-(diphenylphosphino)phenyl]ether cation has been designed and investigated in photophysics and EPR terms. The complexes exhibit a green luminescence resulted from the Mn(II) d - d transitions ( 4  T  1 → 6  A  1 ) with the wavelength-excitation dependence of the quantum yield. The solid [H 2 DPEphos][MnBr 4 ] complex exhibits a bright green phosphorescence (λ max = 515 nm) with the high luminescence quantum yield depending on the excitation energy whereas the solid [H 2 DPEphos][MnCl 4 ] complex exhibits a very weak phosphorescence (λ max = 523 nm). The unexpected shorter luminescence lifetime for the [H 2 DPEphos][MnCl 4 ] than for the [H 2 DPEphos][MnBr 4 ] at 300 K can be a result of the higher non-radiative relaxation contribution. On the one hand, the non-covalent PH…X(Mn) interactions quench the manganese(II) luminescence. On the other hand, the PH…X(Mn) interactions are a pathway of the excitation transfer from [H 2 DPEphos] 2+ to [MnX 4 ] 2- .

international journal of molecular sciences

A Halomanganates(II) with P,P’-Diprotonated Bis(2-Diphenylphosphinophenyl)ether: Wavelength-Excitation Dependence of the Quantum Yield and Role of the Non-Covalent Interactions